Spring的AOP注解功能

Spring对AOP的实现提供了很好的支持。下面我们就使用Spring的注解来完成AOP做一个例子。

首先，为了使用Spring的AOP注解功能，必须导入如下几个包。aspectjrt.jar,aspectjweaver.jar,cglib-nodep.jar.

1、实体bean
Java代码 收藏代码

public class Person {

private Long id;
private String name;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

2、接口类
Java代码 收藏代码

public interface PersonService {
public void save(Person person);

public void update(Person person);

public Person getByIdPerson(Long id);

public void delete(Long id);
}

3、实现类


Java代码 收藏代码

public class PersonServiceImpl implements PersonService{

Map<Long, Person> maps = new HashMap<Long, Person>();

@Override
public void save(Person person) {
System.out.println("***执行save方法***");
maps.put(person.getId(), person);
}

@Override
public void update(Person person) {
System.out.println("***执行update()方法***");
maps.remove(person.getId());
maps.put(person.getId(), person);
}

@Override
public Person getByIdPerson(Long id) {
System.out.println("***执行getByIdPerson()方法***");
return maps.get(id);
}

@Override
public void delete(Long id) {
System.out.println("***执行delete()方法***");
maps.remove(id);
}
}

4、使用Spring注解方式对这个Bean进行方法拦截
Java代码 收藏代码

@Aspect
public class MyInterceptor {

@Pointcut("execution(* cn.tzz.aop.annotation.service.impl..*.*(..))")
private void anyMethod(){}//定义切点

@Before("anyMethod() && args(person)")
public void doAccessCheck(Person person){
System.out.println(person.getName());
System.out.println("前置通知");
}

@AfterReturning("anyMethod()")
public void doAfter(){
System.out.println("后置通知");
}

@After("anyMethod()")
public void after(){
System.out.println("最终通知");
}

@AfterThrowing("anyMethod()")
public void doAfterThrow(){
System.out.println("异常通知");
}

@Around("anyMethod()")
public Object doBasicProfiling(ProceedingJoinPoint proceedingJoinPoint) throws Throwable{
System.out.println("进入环绕通知");
Object object = proceedingJoinPoint.proceed();//执行该方法
System.out.println("退出方法");
return object;
}
}


Java代码 收藏代码

@Pointcut("execution(* cn.tzz.aop.annotation.service.impl..*.*(..))")

上述是定义方法切入点，execution为执行的意思，*代表任意返回值，然后是包名，.*意思是包下面的所有子包，(..)代表各种方法.



5、在Spring的配置文件中配置Bean,需要打开AOP命名空间
Xml代码 收藏代码

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

<context:annotation-config />
<context:component-scan base-package="cn.tzz.aop.annotation" />

<aop:aspectj-autoproxy proxy-target-class="true" />
<bean id="personService" class="cn.tzz.aop.annotation.service.impl.PersonServiceImpl"></bean>
<bean id="myInterceptor" class="cn.tzz.aop.annotation.MyInterceptor"></bean>

</beans>

6、测试
Java代码 收藏代码

public class TestAop {

private static ApplicationContext ctx = null;
private static PersonService personService = null;

static{
ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
personService = (PersonService)ctx.getBean("personService");
}

public void testSave(){
Person person = new Person();
person.setId(1L);
person.setName("abc");
personService.save(person);
}

public void testGetByIdPerson(){
Person p = personService.getByIdPerson(1L);
System.out.println(p.getId()+"---"+p.getName());
}

public void testUpdate(){
Person person = new Person();
person.setId(1L);
person.setName("abc_1");
personService.update(person);
}

public void testDelete(){
personService.delete(1L);
}

@Test
public void testInteceptor(){
testSave();
// testGetByIdPerson();
// testUpdate();
// testGetByIdPerson();
// testDelete();
// testGetByIdPerson();
}
}

7、测试结果
Java代码 收藏代码

abc
前置通知
进入环绕通知
***执行save方法***
后置通知
退出方法
最终通知